“…These tasks, interfaces and individuals always work in correlation and influence the cognitive load. Concerning this correlation and influence, usability and CLT studies have been conducted in the area of cognitive ergonomics (Ahlstrom and Freidman-Berg, 2006;Evans and Gibbons, 2007;Cierniak et al, 2008;Austin, 2009;van Gog et al, 2009a;De Koning et al, 2010;Liu and Chuang, 2010;Liu et al, 2011;Galy et al, 2012;Wang et al, 2014;van Cauwenberge et al, 2014;Huang and Chen, 2015;Jiang et al, 2015;Majooni et al, 2015;Vatavu and Mancas, 2015). Galy et al (2012) investigated the relationship between mental workload factors (task difficulty, time pressure and alertness) and cognitive load types.…”